North Allegheny Intermediate High School was evacuated after a bomb threat Wednesday morning, according to the school's website.
The building was evacuated after a bomb threat was called in to the school shortly before 10 a.m. The school district said all students and staff members are safe.
NAI students were evacuated to Carson Middle School.
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McCandless police, Allegheny County Sheriff's Department and the city of Pittsburgh personnel swept the building using explosive-detecting canines.
The building was deemed clear.
PHOTOS: North Allegheny Intermediate evacuated due to bomb threat
Parents and guardians were allowed to pick up their kids from Carson Middle School if needed. The students who were evacuated to Carson Middle School were transported home at normal dismissal time.
"Communication was perfect. They notified us to come pick up our children. There was a bomb threat and it was being handled properly," parent Bob Dopkosky said.
All activities, including athletics, were canceled.
MCK and CMS were not put on lockdown, according to the district.
The incident did cause major back ups along local roads, and buses for all middle and elementary schools were delayed up to 20 minutes.
Police are still investigating the threat, but determined there is no immediate danger to the school.
There will be additional security in place Thursday.